Window balance

A handy person from Duluth MN says:
I need two of these window balances. I don't know much about them but they say 6k of the copper piece.
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Lauren from SWISCO responded:

Hello, thank you for posting,

Your pivot shoe resembles the 15-177 that is compatible with the Series 152 coil springs. If the coil spring is marked with the number 6, take a look at the S152-6. Please review the overall dimensions to confirm a good fit and let us know if you have any additional questions. 

Alternate image for 15-177
Alternate image for 15-177

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